we both loved lyndon johnson. i don't think he ever read two words on second-term overreach. probably should have. but the point is that he is very aware of what has gone before and he knows that if you don't read all these books about previous presidents, previous leaders, really in world history, you're limiting yourself to yore own personal experience and that is pretty bad. >> is there a particular president, doris, with whom this president identifies the most or respects the most? >> well, i think when he first came into office, obviously, lincoln mattered a great deal to him. i mean, in part probably because the emancipation proclamation, the end of slavery, and he's the first african-american president, almost like closing that circle. but i think as his term went on he was reading about franklin roosevelt, teld di roosevelt. i think there's a sense when the problems change the president that you look back to changes as well. otherwise, we historians would be useful if we didn't help other know what i mean the future. >> one example of this in history is that lincoln a